On 8/27/2015 10:57 PM, Hans Hagen wrote:
On 8/25/2015 5:05 PM, [email protected] wrote:
Hello list,
I'm working on HTML typesetting with ConTeXt.
I wrote a custom expression to test whether an element has a class:
function xml.functions.classes(classAttr)
local classes = {}
if classAttr then
for c in string.gmatch(classAttr, "%S+") do
if (string.len(c) > 0) then classes[c] = true end
end
end
return classes
end
function xml.expressions.hasClass(classAttr, className)
if classAttr and className then
return xml.functions.classes(classAttr)[className] ~= nil
end
return false
end
This way I can write this in my xmlsetup:
\xmlsetsetup{#1}{p[hasClass(@class,'myclass1')]}{html:p:myclass1}
That is better than
- p[@class='myclass1'] (it fails when you have more classes)
- p[contains(@class, 'myclass1')] (it gives you false positives
when you have class="myclass12")
That works, but I would like to write:
\xmlsetsetup{#1}{p[hasClass('myclass1')]}{html:p:myclass1}
omitting the @class argument, because it's obvious.
To omit it I need to access the current collected element.
At page 25 of "Dealing with XML in ConTeXt MkIV" it is said
that the predefined variables "list","l","ll" (I think I need that one)
and "order" are available, but I did not manage to access them.
How can I get the current element in Lua to write
local classAttr = xml.attribute(currentElement, "", "class") ?
function xml.functions.classes(e)
local class = e.at.class
if class then
local classes = { }
for c in string.gmatch(class,"%S+") do
classes[c] = true
end
return classes
else
return { }
end
end
alternative:
function xml.functions.hasclass(e,c,class)
class = class and e.at[class] or e.at.class
if class and class ~= "" then
if class == c then
return true
else
for s in string.gmatch(class,"%S+") do
if s == c then
return true
end
end
end
end
return false
end
.. hasclass("foo")
--
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Hans Hagen | PRAGMA ADE
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